Perhaps you should try some spelling variations:
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"variance function from string program" » "variance functions from string program" (Expand search), "covariance function from string program" (Expand search), "covariance functions from string program" (Expand search), "variance function from strong program" (Expand search), "variance function from spring programa" (Expand search), "variance function from sharing program" (Expand search), "variance function from studying program" (Expand search), "variance function from shading program" (Expand search)

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